Cycloaddition reactions of transition metal hydrazides with alkynes and heteroalkynes: coupling of Ti![[double bond, length as m-dash]](https://www.rsc.org/images/entities/char_e001.gif) NNPh2 with PhCCMe, PhCCH, MeCN and tBuCP†
NNPh2 with PhCCMe, PhCCH, MeCN and tBuCP†                                                    
                    Abstract
The first structurally authenticated [2+2] cycloaddition products of any transition metal ![[double bond, length as m-dash]](https://www.rsc.org/images/entities/char_e001.gif) NNR2 functional group.
NNR2 functional group.
 
                



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        ![[double bond, length as m-dash]](https://www.rsc.org/images/entities/h2_char_e001.gif) NNPh2 with PhCCMe, PhCCH, MeCN and tBuCP
NNPh2 with PhCCMe, PhCCH, MeCN and tBuCP